Contact TIP and GAS Nozzle Installation

B-3	INSTALLATION	B-3

f.Screw the gas diffuser onto the end of the gun tube and tighten with the wrench provided.

g.Tighten the set screw in the side of the gas diffuser against the cable liner using the Allen wrench pro- vided.

CAUTION

This screw should only be gently tightened. Overtightening will split or collapse the liner and cause poor wire feeding.

------------------------------------------------------------------------

6. Replace the nozzle insulator and gas nozzle.

CAUTION

This screw should only be gently tightened. Overtightening will split or collapse the liner and cause poor wire feeding.

------------------------------------------------------------------------

h. Replace the nozzle insulator and gas nozzle.

INSTALLATION OF M18732 SERIES LINERS FOR FEEDING ALUMINUM ELECTRODE

1.Lay the gun out straight on a flat surface and remove the gas nozzle.

A.For all K466 except K466-3 and K466-4 connec- tions, back out the set screw in the connector end with a 5/64 (2.0 mm) Allen wrench.

B.For all K466-3 and K466-4 connections: Remove the connector cap.

C.Back out the set screw in the diffuser for guns that have a set screw in the diffuser.

2.Remove the liner and insert a new untrimmed liner into the connector end of the cable. Check that the coils of the spring liner can be seen through the holes in the gas diffuser.

A.For all K466-3 and K466-4 connections: If the liner is going to be replaced with a different size liner, loosen the set screw on the connector cap and replace the liner material with the correct size.

3.Mark the liner 3/16" (5 mm) from the end of the liner guide or connector. Pull the liner partially out and cut off the liner at the mark using a sharp knife.

4.Screw the brass liner nipple onto the liner and fully seat the liner busing into the liner guide or the con- nector.

A.For connector kits, except K466-3 and K466-4, tighten the set screw in the cable connector.

B.For K466-3 and K466-4, screw in the connector cap.

5.For guns with a diffuser set screw, tighten the set screw in the side of the gas diffuser against the cable liner using the Allen wrench provided.

a.Choose the correct size contact tip for the electrode being used (wire size is stenciled on the side of the contact tip) and screw it snugly into the gas diffuser.

b.Be sure the nozzle insulator is fully screwed onto the gun tube and does not block the gas holes in the diffuser. (NOTE: Insulator is not required when using the optional fixed gas nozzles.)

c.Slip the appropriate gas nozzle onto the nozzle insulator. Adjustable gas nozzles are available with a .62” (15.9 mm) or .50” (12.7 mm) I.D., and in both standard (flush) and recessed design. The proper nozzle should be selected based on the welding application. Different length fixed nozzles are also available to fit 300 and 400 amp gun tubes to allow either spray or short-circuiting transfer welding.

Choose the gas nozzle as appropriate for the GMAW process to be used. Typically, the contact tip end should be flush to .12” (3.1 mm) extended for the short-circuiting transfer process and .12” (3.1

mm)recessed for spray transfer. For the Outershield (FCAW) process, 1/8” (3 mm) recess is recommended.

MAGNUM 300 & 400